Table 2.

Intervention cost components and cost per item/family

Items	Resource use	Unit cost (£)	Cost/item (£)
Family arm
Kick-off meeting	75 min+	0.33	25
Accompanying booklet	12 pages	0.20	2.4
Pedometers	1 pedometer per study participant	4.00	4
Personalised messages	118 Minutes++	0.33	39.3
Online and tangible rewards	5 cards	0.20	1
Total cost	–	–	71.7
Pedometer-only arm
Pedometers	1 pedometer per study participant	4.00	4
Accompanying booklet	12 pages	0.20	2.4
Total cost	–	–	6.4

Note. ⁺ Kick-off meeting duration: 60 min; travelling time:15 min. ⁺⁺ The personalised messages were posted for 11 weeks, which required on average 10.72 min per week per family